Bump actions/setup-dotnet from 4 to 5

Bumps [actions/setup-dotnet](https://github.com/actions/setup-dotnet) from 4 to 5.
- [Release notes](https://github.com/actions/setup-dotnet/releases)
- [Commits](actions/setup-dotnet@v4...v5)

---
updated-dependencies:
- dependency-name: actions/setup-dotnet
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/test-plugin-mixed.yaml

@@ -75,7 +75,7 @@ jobs:
         bazelisk info release
     #! - name: Setup tmate session
     #!   uses: mxschmitt/action-tmate@v3
-    - uses: actions/setup-dotnet@v4
+    - uses: actions/setup-dotnet@v5
       if: inputs.plugin == 'rabbit'
       with:
         dotnet-version: '8.0'

.github/workflows/test-plugin.yaml

@@ -72,7 +72,7 @@ jobs:
         bazelisk info release
     #! - name: Setup tmate session
     #!   uses: mxschmitt/action-tmate@v3
-    - uses: actions/setup-dotnet@v4
+    - uses: actions/setup-dotnet@v5
       if: inputs.plugin == 'rabbit'
       with:
         dotnet-version: '3.1.x'